Constructor

Constructor provides information about, and access to, a single
constructor for a class.

Constructor permits widening conversions to occur when matching the
actual parameters to newInstance() with the underlying
constructor's formal parameters, but throws an
IllegalArgumentException if a narrowing conversion would occur.

Causes the current thread to wait until another thread invokes the
notify() method or the
notifyAll() method for this object, or
some other thread interrupts the current thread, or a certain
amount of real time has elapsed.

Public methods

equals

Compares this Constructor against the specified object.
Returns true if the objects are the same. Two Constructor objects are
the same if they were declared by the same class and have the
same formal parameter types.

getDeclaredAnnotations

Returns annotations that are directly present on this element.
This method ignores inherited annotations.
If there are no annotations directly present on this element,
the return value is an array of length 0.
The caller of this method is free to modify the returned array; it will
have no effect on the arrays returned to other callers.

getExceptionTypes

Returns an array of Class objects that represent the
types of exceptions declared to be thrown by the underlying
executable represented by this object. Returns an array of
length 0 if the executable declares no exceptions in its throws clause.

getGenericExceptionTypes

Returns an array of Type objects that represent the
exceptions declared to be thrown by this executable object.
Returns an array of length 0 if the underlying executable declares
no exceptions in its throws clause.

If an exception type is a type variable or a parameterized
type, it is created. Otherwise, it is resolved.

getGenericParameterTypes

Returns an array of Type objects that represent the formal
parameter types, in declaration order, of the executable represented by
this object. Returns an array of length 0 if the
underlying executable takes no parameters.

If a formal parameter type is a parameterized type,
the Type object returned for it must accurately reflect
the actual type parameters used in the source code.

If a formal parameter type is a type variable or a parameterized
type, it is created. Otherwise, it is resolved.

getParameterAnnotations

Returns an array of arrays of Annotations that
represent the annotations on the formal parameters, in
declaration order, of the Executable represented by
this object. Synthetic and mandated parameters (see
explanation below), such as the outer "this" parameter to an
inner class constructor will be represented in the returned
array. If the executable has no parameters (meaning no formal,
no synthetic, and no mandated parameters), a zero-length array
will be returned. If the Executable has one or more
parameters, a nested array of length zero is returned for each
parameter with no annotations. The annotation objects contained
in the returned arrays are serializable. The caller of this
method is free to modify the returned arrays; it will have no
effect on the arrays returned to other callers.
A compiler may add extra parameters that are implicitly
declared in source ("mandated"), as well as parameters that
are neither implicitly nor explicitly declared in source
("synthetic") to the parameter list for a method. See Parameter for more information.

getParameterTypes

Returns an array of Class objects that represent the formal
parameter types, in declaration order, of the executable
represented by this object. Returns an array of length
0 if the underlying executable takes no parameters.

getTypeParameters

Returns an array of TypeVariable objects that represent the
type variables declared by the generic declaration represented by this
GenericDeclaration object, in declaration order. Returns an
array of length 0 if the underlying generic declaration declares no type
variables.

newInstance

Uses the constructor represented by this Constructor object to
create and initialize a new instance of the constructor's
declaring class, with the specified initialization parameters.
Individual parameters are automatically unwrapped to match
primitive formal parameters, and both primitive and reference
parameters are subject to method invocation conversions as necessary.

If the number of formal parameters required by the underlying constructor
is 0, the supplied initargs array may be of length 0 or null.

If the constructor's declaring class is an inner class in a
non-static context, the first argument to the constructor needs
to be the enclosing instance; see section 15.9.3 of
The Java™ Language Specification.

If the required access and argument checks succeed and the
instantiation will proceed, the constructor's declaring class
is initialized if it has not already been initialized.

If the constructor completes normally, returns the newly
created and initialized instance.

Parameters

initargs

Object: array of objects to be passed as arguments to
the constructor call; values of primitive types are wrapped in
a wrapper object of the appropriate type (e.g. a float
in a Float)

Returns

T

a new object created by calling the constructor
this object represents

if the number of actual
and formal parameters differ; if an unwrapping
conversion for primitive arguments fails; or if,
after possible unwrapping, a parameter value
cannot be converted to the corresponding formal
parameter type by a method invocation conversion; if
this constructor pertains to an enum type.

toGenericString

Returns a string describing this Constructor,
including type parameters. The string is formatted as the
constructor access modifiers, if any, followed by an
angle-bracketed comma separated list of the constructor's type
parameters, if any, followed by the fully-qualified name of the
declaring class, followed by a parenthesized, comma-separated
list of the constructor's generic formal parameter types.
If this constructor was declared to take a variable number of
arguments, instead of denoting the last parameter as
"Type[]", it is denoted as
"Type...".
A space is used to separate access modifiers from one another
and from the type parameters or return type. If there are no
type parameters, the type parameter list is elided; if the type
parameter list is present, a space separates the list from the
class name. If the constructor is declared to throw
exceptions, the parameter list is followed by a space, followed
by the word "throws" followed by a
comma-separated list of the thrown exception types.

The only possible modifiers for constructors are the access
modifiers public, protected or
private. Only one of these may appear, or none if the
constructor has default (package) access.

toString

Returns a string describing this Constructor. The string is
formatted as the constructor access modifiers, if any,
followed by the fully-qualified name of the declaring class,
followed by a parenthesized, comma-separated list of the
constructor's formal parameter types. For example:

public java.util.Hashtable(int,float)

The only possible modifiers for constructors are the access
modifiers public, protected or
private. Only one of these may appear, or none if the
constructor has default (package) access.